A body temperature reading above or below the average doesn’t automatically mean you’re sick. Several factors can influence your body temperature , including age, sex, time of day, and activity ... Guide to normal , fever, and low human body temperature , with charts and expert tips for accurate measurement and health monitoring. The average normal body temperature is usually measured as 98.6°F or 37°C. A body temperature range above 100.4°F or 38°C is mostly considered a high body temperature or fever instigated by an infection or ailment. The average normal body temperature is generally accepted as 98.6°F (37°C) . Some studies have shown that the normal body temperature can have a wide range, from 97°F (36.1°C) to 99°F (37.2°C). A temperature over 100.4°F (38°C) most often means you have a fever caused by an infection or illness.